<div class="example">
  <button id="calculate" class="button run">
    Calculate
  </button>
  <div class="message-box">
    <span><span id="address-output"></span> result: <strong id="result-output"></strong></span>
  </div>
  <table class="spreadsheet">
    <colgroup>
      <col style="width:30%"/>
      <col style="width:30%"/>
      <col style="width:30%"/>
    </colgroup>
    <thead></thead>
    <tbody></tbody>
  </table>
</div>